<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <button @click="counter+=1">点击加1{{counter}}</button>
  </div>
</body>
<script src="./node_modules/vue/dist/vue.js"></script>
<script>

  let vm = new Vue({
    el:"#app",
    data:{
      counter:1,
    }
  })


</script>
</html>